Aah found it, it does do Cisco hack. https://github.com/FRRouting/frr/blob/58980443821edf95719984e01f31720bd1dc7f79/isisd/isis_constants.h#L172-L180
But as long as you don't pad, your PDU shouldn't exceed 1500B. On Mon, 6 Apr 2020 at 12:58, Saku Ytti <[email protected]> wrote: > > From your original post: > > > 2020/03/21 03:12:36 ISIS: isis_send_pdu_bcast: sock_buff size 8192 is less > > than output pdu size 9014 on circuit em0 > > 2020/03/21 03:12:36 ISIS: [EC 67108865] ISIS-Adj (1): Send L2 IIH on em0 > > failed > > Why is PDU 9014, if you don't have padding? I wonder what FRR even > does at >1500B, I don't see '8870' in source code, so I don't think it > supports the EthernetII hack. > > I wonder did someone verify the fix, to see what it even does? To me > it looks like what it'll do, it'll use what ever ethernetII matches > byte-size of frame, which is decidedly, not correct and would not > interoperate after 'fix'. > > -- > ++ytti -- ++ytti
